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Gerard Petersen's Boat Hull Script

Looking through tutorials one day I stumbled upon a set of videos on Youtube demonstrating the use of Grasshopper to generate boat hulls.  The video demonstrated the use of parametric definitions to create a ships hull that is adjustable based on keel depth, displacement, and  stern vs. bow proportions.  I contacted the author of the video, Gerard Petersen, to get more information about how he structured his script for the boat.  He was kind enough to email us this script.  Max and I spent several hours examining and trying to make sense of this very complex script.  What we discover is that Gerard used an equation to define each specific cross section at certain intervals along the boats hull.  Then by assigning a number slider/inputs to the variables associated to each equation he is able to generate a parametric form that is very fluid and editable based on specific numerical input.

Gerard Petersen's Youtube Video

You can view this video @ http://www.youtube.com/watch?v=lbV9MllyP8I&feature=related